API for CL-6502

-Variables

*cpu*: #S(|6502|:CPU :PC 65532 :SP 253 :SR 36 :XR 0 :YR 0 :AR 0 :CC 0) variable

The 6502 instance used by default during execution.

-Conditions

cpu (structure-object) class

A 6502 CPU with an extra slot for tracking the cycle count/clock ticks.

-Functions

asm source standard-generic-function

Assemble SOURCE into a bytevector and return it.

current-instruction cpu &optional print-p function

Return a list representing the current instruction. If PRINT-P is non-nil,
print the current address and instruction and return NIL.

disasm start end function

Disassemble memory from START to END.

disasm-to-list start end function

Disassemble a given region of memory into a sexp-based format.

disasm-to-str start end function

Call DISASM with the provided args and return its output as a string.

execute cpu function

Step the CPU until a BRK instruction.

get-byte address function

Get a byte from RAM at the given ADDRESS.

(setf get-byte) new-val address function

Set ADDRESS in *ram* to NEW-VAL.

get-range start &optional end function

Get a range of bytes from RAM, starting from START and stopping at END if
provided.

(setf get-range) bytevector start function

Replace the contents of RAM, starting from START with BYTEVECTOR.

get-word address &optional wrap-p function

Get a word from RAM starting at the given ADDRESS.

(setf get-word) new-val address function

Set ADDRESS and (1+ ADDRESS) in *ram* to NEW-VAL, little endian ordering.

jit-step cpu pc function

If the current block has been JIT compiled, run it, otherwise JIT compile it.

nmi obj standard-generic-function

Generate a non-maskable interrupt. Used for vblanking in NES.

reset obj standard-generic-function

Reset the OBJ to an initial state.

step-cpu cpu opcode function

Step the CPU through the next OPCODE.